USG20-VPN low internet LAN speed comparing to WAN


I'm experiencing a strange issue with that FW.

The internet connection speed took from Fiber line router is about 850 Mbit/sec (1Gbit contract).

Looking at the FW control panel, the LAN1 connection is regularly negotiated at 1000M (1Gbit) but the internet speed is capped at 400/420 Mbit.

No way to get the 850 that router can provide.

Is there any kind of hidden speed control i can't see in FW control panel?


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